Locking device for fuse-plugs.



T. E. MURRAY. v LOCKING DEVICE FOR FUSE PLUGS.

APPLICATION FILED JUNE 9,1908.

908, 1 1 8. Patented Dec. 29, 1908.1

( .IHIIIHIHIIHW i h j [4 6272 asses: fnz/entar UNITE STATES PATENT OEFICE.

THOMAS E. MURRAY, OF NEW YORK, N. Y.

LOCKING DEVICE FOR FUSE-PLUGS.

To all whom it may concern:

Be it known that I, THoMAs E. MURRAY, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Looking Devices for Fuse- Plugs, of which the following is a specification.

The invention relates to means for locking in place the fuse plugs in an electrical cut out box or support, and at the same time securingthe cover of said box, so that said cover cannot be raised to afiord access to the interior.

The invention consists in the construction more articularly pointed out in the claims, and a so in the fuse plug body as a new article of manufacture and sale.

In the accom anying drawings-Figure 1 isa plan view 0 a cut out box showing two pairs of fuse plugs seated therein. Fig. 2 is a side elevation, a portion of the box and cover being broken away. Fig. 3 shows one of the fuse plug bodies and Fig. 4 a locking bar, separately.

Similar numbers of reference indicate like parts.

1 is a cut out box, and 2 is a downwardly flanged cover therefor. In the box 1 are internally threaded seats, one of whichis shown at 3, which receive the similarly threaded fuse plugs 4, 5, 6, 7; the said plugs then passing through openings in the cover 2. As the electrical connections in the cut out box, with which connections the fuse plugs make contact when seated and locked, form no part of the present invention, they are not shown or described.

The fuse plug bodies are cylindrical and preferably formed of porcelain or other fictile material. Each body has a threaded lower portion 8, a flange 10 of larger diameter than the opening 'in the cover, and above said flange an upwardly enlarging cup-shaped portion 11 having, in its walls, slots 12.

The cover 2 being placed on the box 1, the plugs are inserted 1n their seat so as to es-. tablish electrical contact with the connections in the box in the usual way. In order to lock both lugs and cover in place, I provide a bar 9, l ig. 4, having a cross head 13 at one end, which bar is inserted through diametrically opposite slots in cup 11 of one Specification of Letters Patent. Application filed .fune 9, 1908. Serial No. 437,506.

Patented Dec. 29, 1908.

ally opposite slots of cup 11 in another plug plug (as 4), and then through the diametric- I (as 5), so that the head 13 preferably bears against the exterior of the cup. By this means rotation of said plugs in order to unscrew them from their seats is prevented. It is, of course, to be understood that the relative positions of the slots in the cup-shaped flanges of each pair of plugs, receiving a .bar 9 is to.be such as that said slots will come diametrically opposite one another, as

before defined, when said plugs make proper glectrical contact with the connections in the In order to prevent removal of the locking bar 9, an opening is formed near the end of said bar, through which opening, after said bar has been passed through the slots, as above described, the shackle of any suitable seal 14 may be inserted.

Iclairn:

1. The combination of a support having two internally threaded openings, a cover therefor'having apertures respectively above said openings, threaded plugs constructed to enter said threaded openings, acupsha ed flange having slots in its wall on each p ug, and a lonkingbar constructed topass throu h diametrically opposite slots in each of sai cup-shaped flanges.

2. Thc'combination of a support having two internally threaded openlngs, a cover therefor having apertures respectively above said openings, threaded plugs constructed to enter said 0 enings and having flanges above their threa ed portions, a cup-sha ed flange threaded portion, a flange, and above said flange a flaring cup-shaped portion having slots formed in its wall.

In testimony whereof I have afiixed my signature inpresence of two witnesses.

THOMAS E. MURRAY.

Witnesses:

GERTRUDE T. PORTER, MAY T. MCGARRY. 

